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      golang socket 尝试
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        <p>收集一些golang常用的一些技术。</p>
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<ul>
<li><a href="#%E6%9C%8D%E5%8A%A1%E5%99%A8%E9%83%A8%E5%88%86">服务器部分</a></li>
<li><a href="#%E5%AE%A2%E6%88%B7%E7%AB%AF%E9%83%A8%E5%88%86">客户端部分</a></li>
<li><a href="#%E9%80%9A%E8%BF%87%E8%AE%A9%E4%B8%BB%E7%BA%BF%E7%A8%8B%E7%AD%89%E5%BE%85%E4%BA%8B%E4%BB%B6">通过让主线程等待事件</a></li>
<li><a href="#%E6%95%B0%E6%8D%AE%E8%A7%A3%E6%9E%90%E5%A1%AB%E6%8A%A5%E4%BB%A3%E7%A0%81">数据解析、填报代码</a></li>
<li><a href="#%E5%8F%91%E9%80%81%E6%95%B0%E6%8D%AE%E7%9A%84%E5%AE%9E%E4%BE%8B">发送数据的实例</a></li>
<li><a href="#%E7%9F%A5%E8%AF%86%E7%82%B9">知识点：</a></li>
</ul>
<p><a target="_blank" rel="noopener" href="https://github.com/name5566/leaf">参考【leaf】</a> 初步学着编写一个tcp服务器，一个连接他的client。</p>
<h1 id="服务器部分"><a href="#服务器部分" class="headerlink" title="服务器部分"></a>服务器部分</h1><figure class="highlight golang"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">&quot;net&quot;</span></span><br><span class="line">	<span class="string">&quot;os&quot;</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">Start</span><span class="params">()</span></span> &#123;</span><br><span class="line">	l, err := net.Listen(<span class="string">&quot;tcp&quot;</span>, <span class="string">&quot;127.0.0.1:8866&quot;</span>)</span><br><span class="line">	<span class="keyword">if</span> err != <span class="literal">nil</span> &#123;</span><br><span class="line">		fmt.Println(err.Error())</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line">  <span class="keyword">go</span> main_loop(l)</span><br><span class="line">  </span><br><span class="line">  <span class="comment">// ...</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main_loop</span><span class="params">(l net.Listener)</span></span> &#123;</span><br><span class="line">	<span class="keyword">for</span> &#123;</span><br><span class="line">		conn, err := l.Accept()</span><br><span class="line">		<span class="keyword">if</span> err != <span class="literal">nil</span> &#123;</span><br><span class="line">			fmt.Println(err.Error())</span><br><span class="line">			<span class="keyword">continue</span></span><br><span class="line">		&#125;</span><br><span class="line">		<span class="keyword">go</span> client_loop(conn)</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">client_loop</span><span class="params">(conn net.Conn)</span></span> &#123;</span><br><span class="line">	fmt.Println(conn.RemoteAddr().String())</span><br><span class="line">  <span class="comment">// ...</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h1 id="客户端部分"><a href="#客户端部分" class="headerlink" title="客户端部分"></a>客户端部分</h1><figure class="highlight golang"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">&quot;fmt&quot;</span></span><br><span class="line">	<span class="string">&quot;net&quot;</span></span><br><span class="line">)</span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> &#123;</span><br><span class="line">	conn, err := net.Dial(<span class="string">&quot;tcp&quot;</span>, <span class="string">&quot;127.0.0.1:8866&quot;</span>)</span><br><span class="line">	<span class="keyword">if</span> err != <span class="literal">nil</span> &#123;</span><br><span class="line">		fmt.Println(err)</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">go</span> handleClient(conn)</span><br><span class="line">  <span class="comment">// ...</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">handleClient</span><span class="params">(conn net.Conn)</span></span> &#123;</span><br><span class="line">  <span class="comment">//....</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h1 id="通过让主线程等待事件"><a href="#通过让主线程等待事件" class="headerlink" title="通过让主线程等待事件"></a>通过让主线程等待事件</h1><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">&quot;os/signal&quot;</span></span><br><span class="line">)</span><br><span class="line">	</span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> &#123;</span><br><span class="line">	c := <span class="built_in">make</span>(<span class="keyword">chan</span> os.Signal, <span class="number">1</span>)</span><br><span class="line">	signal.Notify(c, os.Interrupt, os.Kill)</span><br><span class="line">	sig := &lt;-c</span><br><span class="line">	fmt.Println(sig.String())</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h1 id="数据解析、填报代码"><a href="#数据解析、填报代码" class="headerlink" title="数据解析、填报代码"></a>数据解析、填报代码</h1><p>下面的代码是简单的从socket里面读取数据，在数据头上增加一个头，little-endian方式的uint16。后面是一块数据.</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">&quot;encoding/binary&quot;</span></span><br><span class="line">	<span class="string">&quot;errors&quot;</span></span><br><span class="line">	<span class="string">&quot;io&quot;</span></span><br><span class="line">	<span class="string">&quot;net&quot;</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="comment">// --------------</span></span><br><span class="line"><span class="comment">// | len | data |</span></span><br><span class="line"><span class="comment">// --------------</span></span><br><span class="line"><span class="keyword">type</span> MsgPack <span class="keyword">struct</span> &#123;</span><br><span class="line">	maxMsgLen    <span class="keyword">uint16</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">NewMsgPack</span><span class="params">()</span> *<span class="title">MsgPack</span></span> &#123;</span><br><span class="line">	p := <span class="built_in">new</span>(MsgPack)</span><br><span class="line">	p.maxMsgLen = <span class="number">4096</span></span><br><span class="line"></span><br><span class="line">	<span class="keyword">return</span> p</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="params">(c *MsgPack)</span> <span class="title">ReadPack</span><span class="params">(session net.Conn)</span> <span class="params">([]<span class="keyword">byte</span>, error)</span></span> &#123;</span><br><span class="line">	<span class="keyword">var</span> headData []<span class="keyword">byte</span> = <span class="built_in">make</span>([]<span class="keyword">byte</span>, <span class="number">2</span>)</span><br><span class="line">	<span class="keyword">if</span> _, err := io.ReadFull(session, headData); err != <span class="literal">nil</span> &#123;</span><br><span class="line">		<span class="keyword">return</span> <span class="literal">nil</span>, err</span><br><span class="line">	&#125;</span><br><span class="line">	msgLen := <span class="keyword">uint16</span>(binary.LittleEndian.Uint16(headData))</span><br><span class="line">	<span class="keyword">if</span> msgLen &gt; c.maxMsgLen &#123;</span><br><span class="line">		<span class="keyword">return</span> <span class="literal">nil</span>, errors.New(<span class="string">&quot;message too long&quot;</span>)</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	msgData := <span class="built_in">make</span>([]<span class="keyword">byte</span>, msgLen)</span><br><span class="line">	<span class="keyword">if</span> _, err := io.ReadFull(session, msgData); err != <span class="literal">nil</span> &#123;</span><br><span class="line">		<span class="keyword">return</span> <span class="literal">nil</span>, err</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">return</span> msgData, <span class="literal">nil</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// goroutine safe</span></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="params">(p *MsgPack)</span> <span class="title">WritePack</span><span class="params">(conn net.Conn, args ...[]<span class="keyword">byte</span>)</span> <span class="title">error</span></span> &#123;</span><br><span class="line">	<span class="comment">// get len</span></span><br><span class="line">	<span class="keyword">var</span> msgLen <span class="keyword">uint16</span></span><br><span class="line">	<span class="keyword">for</span> i := <span class="number">0</span>; i &lt; <span class="built_in">len</span>(args); i++ &#123;</span><br><span class="line">		msgLen += <span class="keyword">uint16</span>(<span class="built_in">len</span>(args[i]))</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">// check len</span></span><br><span class="line">	<span class="keyword">if</span> msgLen &gt; p.maxMsgLen &#123;</span><br><span class="line">		<span class="keyword">return</span> errors.New(<span class="string">&quot;message too long&quot;</span>)</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	msg := <span class="built_in">make</span>([]<span class="keyword">byte</span>, <span class="keyword">uint32</span>(<span class="number">2</span>)+<span class="keyword">uint32</span>(msgLen))</span><br><span class="line"></span><br><span class="line">	<span class="comment">// write len</span></span><br><span class="line">	binary.LittleEndian.PutUint16(msg, <span class="keyword">uint16</span>(msgLen))</span><br><span class="line"></span><br><span class="line">	<span class="comment">// write data</span></span><br><span class="line">	l := <span class="number">2</span></span><br><span class="line">	<span class="keyword">for</span> i := <span class="number">0</span>; i &lt; <span class="built_in">len</span>(args); i++ &#123;</span><br><span class="line">		<span class="built_in">copy</span>(msg[l:], args[i])</span><br><span class="line">		l += <span class="built_in">len</span>(args[i])</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	conn.Write(msg)</span><br><span class="line"></span><br><span class="line">	<span class="keyword">return</span> <span class="literal">nil</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h1 id="发送数据的实例"><a href="#发送数据的实例" class="headerlink" title="发送数据的实例"></a>发送数据的实例</h1><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">buf := []<span class="keyword">byte</span>(<span class="string">&quot;hello dial person! abel is online!&quot;</span>)</span><br><span class="line">pack.WritePack(conn, buf)</span><br></pre></td></tr></table></figure>

<h1 id="知识点："><a href="#知识点：" class="headerlink" title="知识点："></a>知识点：</h1><ul>
<li>通过struct组织数据结构</li>
<li>启动go里面的一个进程来处理数据包</li>
<li>挂载signal处理</li>
<li>tcp的包拆解</li>
<li>大端小端解析integer的基本用法</li>
<li>报错处理</li>
</ul>

      
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